Synthesis and Electrochemical Properties of a LiNi_(0.7)Co_(0.3)O_(1.9)Cl_(0.1)Cathode Material for Lithium-ion Battery

摘要

Partial oxygen in LiNi_(0.7)Co_(0.3)O_2 was replaced by chlorine to form LiNi_(0.7)Co_(0.3)O_(1.9)Cl_(0.1). Phase structure of LiNi_(0.7)Co_(0.3)O_(1.9)Cl_(0.1) was identified as a pure hexagonal lattice of α-NaFeO)2 type by X-ray diffraction. Discharge capacity of LiNi_(0.7)Co_(0.3)O_(1.9)Cl_(0.1) was 202 mAh/g in initial cycle at 15 mA/g current density in 2.5- 4.3 V potential window. The constant current charge/discharge experiments and cyclic voltammograms showed that chlorine addition was effective to improve reversible capacity and cycle stability of LiNi_(0.7)Co_(0.3)O_2.